GB305065A - Improved process of and apparatus for renovating cards of the type used in accounting machines - Google Patents

Abstract

305,065. Valtat, R. L. A., and Gros, P. Oct. 27, 1927. Statistical apparatus. - Perforated cards used in accounting machines are renovated by pasting thereon sheets of material of accurate predetermined thickness cut to accurate dimensions, and testing the electrical insulating properties of the renovated cards. The applied sheets of material may be of slightly smaller dimensions than the card. One sheet mav be applied to each side of the card and pressed into the card, and the holes in the latter may be previously filled with adhesive pasty material. In the method described a continuous strip of material is applied to a number of cards, and subsequently severed to separate the cards. The cards are placed in a receptacle 1, Fig. 1, and fed therefrom by mechanism 2 of known type which pushes them one by one in abutting relation through a pair of pressure rollers 5. The paper to be pasted on the cards is drawn from a roll 3, passes over a paste roller 4, and then between the rollers 5 where it is applied to the cards. The paste preferably used consists of 20 grams of powdered gum arabic, 5 grams of sugar and 75 grams of boiling water made into a solution, and stirred together with a mixture of 15 grams of starch and 30 grams of cold water, 300 grams of boiling water being added. Two rolls of paper and two sets of pasting rollers may be used to apply paper to both sides of the cards. To close the perforations in the cards, liquid paper paste or similar material may be applied by means of mechanism of known type. This is effected after pasting paper on one side of the cards but before applying paper to the other side. The cards pass from the rollers 5 to a series of heated drying rollers 6, and between pressure rollers 7 which press the applied paper into the body of the cards. The cards are then separated by a cutting mechanism 10 which cuts through the paper. The cutting mechanism is actuated by a spring-pressed roller 9, Fig. 2, which when it drops into the gaps formed by the cut-off corners 12 of two adjacent cards, causes a thin blade to enter between the cards. The apparatus for testing the finished cards comprises a receptacle 12, Fig. 4, with feed mechanism 13, by means of which the cards are passed one by one over a metallic surface 17 and at the same time under a series of metallic brushes 14. The plate 17 is carried by an electrically operated mechanism 16 which causes the plate to tilt downwards when a circuit is completed between the brushes 14 and the plate by the passage of a card with defective insulation, and so reject the card. Cards with satisfactory insulation are pushed on into a box 18.